-
Hans ans Zacharias Janssen
They created the compound microscope. -
Robert Hooke
Schleiden became the first to formulate what was then an informal belief as a principle of biology equal in importance to the atomic theory of chemistry. He also recognized the importance of the cell nucleus, discovered in 1831 by the Scottish botanist Robert Brown, and sensed its connection with cell division. -
Anton van Leeuwenhoek
used microscopes to view many things including pond organisms, bacteria and blood cells. He made careful sketches of what he observed. -
Matthias Schleiden
In 1838 Schleiden proposed that all plants are composed of cells; -
Theodor Schwann
The theory states that all living things are made up of one or more cells. -
Rudolph Virchow
writes and publishes his aphorism omnis cellula e cellula, which means every cell stems from another cell.